首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1752928篇
  免费   141088篇
  国内免费   3029篇
耳鼻咽喉   23781篇
儿科学   57786篇
妇产科学   50346篇
基础医学   248582篇
口腔科学   51632篇
临床医学   151882篇
内科学   348882篇
皮肤病学   38897篇
神经病学   142906篇
特种医学   68408篇
外国民族医学   502篇
外科学   263022篇
综合类   40575篇
现状与发展   3篇
一般理论   610篇
预防医学   139343篇
眼科学   39656篇
药学   132356篇
  3篇
中国医学   3404篇
肿瘤学   94469篇
  2018年   19414篇
  2017年   14671篇
  2016年   15945篇
  2015年   18376篇
  2014年   25092篇
  2013年   37835篇
  2012年   52296篇
  2011年   54789篇
  2010年   31954篇
  2009年   30083篇
  2008年   51145篇
  2007年   53730篇
  2006年   54301篇
  2005年   52952篇
  2004年   51744篇
  2003年   49199篇
  2002年   48030篇
  2001年   79579篇
  2000年   82283篇
  1999年   69759篇
  1998年   18875篇
  1997年   17142篇
  1996年   17078篇
  1995年   16675篇
  1994年   15603篇
  1993年   14727篇
  1992年   57145篇
  1991年   55429篇
  1990年   54132篇
  1989年   52213篇
  1988年   48561篇
  1987年   47816篇
  1986年   45464篇
  1985年   43986篇
  1984年   32902篇
  1983年   28323篇
  1982年   16598篇
  1981年   14826篇
  1979年   31305篇
  1978年   21651篇
  1977年   18240篇
  1976年   17175篇
  1975年   18155篇
  1974年   22261篇
  1973年   21403篇
  1972年   19496篇
  1971年   18388篇
  1970年   16933篇
  1969年   15880篇
  1968年   14543篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
142.
On 8 April 2014, a US jury ordered Takeda and Eli Lilly to pay $9 bn in punitive damages after finding that they had concealed the cancer risks associated with pioglitazone. By contrast, on 28 August 2014, the long‐awaited outcome of the 10‐year Kaiser Permanente Northern California study was announced. That study was specifically designed to investigate whether patients exposed to pioglitazone were at an increased risk of bladder cancer and found no association; thus, at last, the controversial issue has been resolved. A review, in retrospect, of the story of the proposed link between pioglitazone and bladder cancer reveals flaws at every stage. In 2012, a BMJ editorial, in keeping with some other contemporary reports, stated ‘it can confidently be assumed that pioglitazone increases the risk of bladder cancer’. Examination of the information which led to such a statement shows that: 1) the pre‐clinical findings of bladder cancer in male rats is not indicative of human risk; 2) there is no association between bladder cancer and pioglitazone in randomized controlled trials, once cases that could not plausibly be related to treatment are removed; and 3) the observational studies that have suggested a link have over‐extrapolated from the data: pioglitazone‐treated patients had more risk factors for bladder cancer than those not treated with pioglitazone. Meanwhile careful study of randomized controlled trials shows evidence of cardiovascular benefit from pioglitazone in Type 2 diabetes, a condition which results, more than anything, in premature cardiovascular death and morbidity.  相似文献   
143.
144.
While peer support has been investigated in multiple clinical contexts, its application to the postpartum setting is unknown. The aim was to assess acceptability of a postpartum peer support program for women with diabetes. Observational survey-based needs assessment of forty low-income women with diabetes, receiving care at a major medical institution. Mean age and gravidity were 30.7 years and 3.15 ± 1.67 respectively. 45 % expressed interest in a “buddy.” There was no significant difference between groups desiring and not desiring this program. A majority of respondents desired telephone, text messaging, and in-person contacts (79.2, 72.1, 83.8 %), with 72.5 % of patients desiring diabetes-related activities during clinic waiting time. Many women desire a postpartum diabetes reciprocal peer program for support outside of clinician visits. Patients are receptive to educational services during their wait and outside of clinic time, a potentially valuable opportunity to share important health information.  相似文献   
145.
146.
Graefe's Archive for Clinical and Experimental Ophthalmology - Retinal microvascular endothelial dysfunction is thought to be of importance in the development of ocular vascular diseases....  相似文献   
147.
148.

Objectives

To determine the incidence of incisional hernia (IH) in the extraction incision (EI) in colorectal resection for cancer. To analyze whether the location of the incision has any relationship with the incidence of hernias and whether mesh could be useful for prevention in high-risk patients.

Methods

Retrospective review of the colon and rectal surgery database from January 2015 to December 2016. Data were classified into 2 groups, transverse (TI) and midline incision (MI), and the latter was divided into 2 subgroups (mesh [MIM] and suture [MIS]). Patients were classified using the HERNIAscore. Hernias were diagnosed by clinical and/or CT examination.

Results

A total of 182 out of 210 surgical patients were included. After a median follow-up of 13.0 months, 39 IH (21.9%) were detected, 23 of which (13.4%) were in the EI; their frequency was lower in the TI group (3.4%) and in the MIM group (5.9%) than in the MIS group (29.5%; p = 0.007). The probability of developing IH in the MIS group showed an OR = 11.7 (95%CI: 3.3-42.0) compared to the TI group and 4.3 (IC 95%: 1.1-16.3) versus the MIM group.

Conclusions

The location of the incision is relevant to avoid incisional hernias. Transverse incisions should be used as the first option. When a midline incision is needed, a prophylactic mesh could be considered in high risk patients because it is safe and associated with low morbidity.  相似文献   
149.
150.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号